Mistake in execute "npm run build extension:chrome"

[randoudou]

Here is the content of my "package.json":
{
"name": "reacttools",
"version": "1.0.0",
"description": "",
"main": "index.js",
"build": "node build/build.js",
"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},
"author": "",
"license": "ISC"
}

and here's debug log:

0 info it worked if it ends with ok
1 verbose cli [ 'D:\Program Files\nodejs\node.exe',
1 verbose cli 'D:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js',
1 verbose cli 'run',
1 verbose cli 'build',
1 verbose cli 'extension:chrome' ]
2 info using npm@6.4.1
3 info using node@v10.15.3
4 verbose stack Error: missing script: build
4 verbose stack at run (D:\Program Files\nodejs\node_modules\npm\lib\run-script.js:155:19)
4 verbose stack at D:\Program Files\nodejs\node_modules\npm\lib\run-script.js:63:5
4 verbose stack at D:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:115:5
4 verbose stack at D:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:418:5
4 verbose stack at checkBinReferences_ (D:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:373:45)
4 verbose stack at final (D:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:416:3)
4 verbose stack at then (D:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:160:5)
4 verbose stack at ReadFileContext. (D:\Program Files\nodejs\node_modules\npm\node_modules\read-package-json\read-json.js:332:20)
4 verbose stack at ReadFileContext.callback (D:\Program Files\nodejs\node_modules\npm\node_modules\graceful-fs\graceful-fs.js:78:16)
4 verbose stack at FSReqWrap.readFileAfterOpen [as oncomplete] (fs.js:237:13)
5 verbose cwd D:\ReactTools
6 verbose Windows_NT 10.0.17134
7 verbose argv "D:\Program Files\nodejs\node.exe" "D:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "run" "build" "extension:chrome"
8 verbose node v10.15.3
9 verbose npm v6.4.1
10 error missing script: build
11 verbose exit [ 1, true ]

Thanks for helping me.
This is my first issue.

[bvaughn]

React DevTools has been rewritten and recently launched a new version 4 UI. The source code for this rewrite was done in a separate repository and now lives in the main React repo (github.com/facebook/react).

Because version 4 was a total rewrite, and all issues in this repository are related to the old version 3 of the extension, I am closing all issues in this repository. If you can still reproduce this issue, or believe this feature request is still relevant, please open a new issue in the React repo: https://github.com/facebook/react/issues/new?labels=Component:%20Developer%20Tools